我想在我的Windows窗体中包含HttpContext.Current.Request

Question

var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();

using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{    
    string json= streamReader.ReadToEnd();
    List<DeSerialiseBL> myDeserializedObjList = (List<DeSerialiseBL>)Newtonsoft.Json.JsonConvert.DeserializeObject(Request[json], typeof(List<DeSerialiseBL>));
}

i want to deserialize the json value.so i use the above code.when i build 'Request is not exist in the current context' error displayed.

Answer 1

In the code in your question, you're successfully deserializing the JSON string you receive from a web request you issue through HttpWebRequest.

Say the response contains { "foo" : "bar" } , then that's the value the variable json contains.

But the expression Request[json] that follows it, makes no sense. I can assure you that the request variables do not contain a key called { "foo" : "bar" } , so the expression Request[json] returns an empty string.

You should not use Request there, but directly pass the json variable:

List<DeSerialiseBL> myDeserializedObjList = 
    (List<DeSerialiseBL>)Newtonsoft.Json.JsonConvert.DeserializeObject(json, typeof(List<DeSerialiseBL>));

The code can be further simplified:

using Newtonsoft.Json; // At the top of your file

var myDeserializedObjList = JsonConvert.DeserializeObject<List<DeSerialiseBL>>(json);

So you don't need HttpRequest.Current, because the json string has no relation at all to the current request.

Answer 2

firstly you can not use HttpContext.Current in win form. winform not running in request pipeline..

DeserializeObject waiting serialize string and type..

    var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
    using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
    {    
         string json= streamReader.ReadToEnd();
         //List<DeSerialiseBL> myDeserializedObjList = (List<DeSerialiseBL>)Newtonsoft.Json.JsonConvert.DeserializeObject(Request[json], typeof(List<DeSerialiseBL>));
         List<DeSerialiseBL> myDeserializedObjList = (List<DeSerialiseBL>)Newtonsoft.Json.JsonConvert.DeserializeObject(json, typeof(List<DeSerialiseBL>));
    }

Answer 3

try this

 string Url = "Your Url";

    HttpClient client = new HttpClient();
    client.BaseAddress = new Uri(Url);
    client.DefaultRequestHeaders.Accept.Clear();
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    HttpResponseMessage response = client.GetAsync(Url).Result;
    if (response.IsSuccessStatusCode)
    {
        var JsonResult = response.Content.ReadAsStringAsync().Result;
        System.Web.Script.Serialization.JavaScriptSerializer tmp = new System.Web.Script.Serialization.JavaScriptSerializer();
        RemoteResult r = (RemoteResult)tmp.Deserialize(JsonResult, typeof(RemoteResult));
         // r.myDeserializedObjList is your desired output
    }

and create class for your desired result.That is

public class RemoteResult
    {
        List<DeSerialiseBL> myDeserializedObjList;
    }